Add auto-assign option for issues created from TODO/FIXME comments

[Copilot]

Adds githubIssues.assignToMeOnCreate setting to automatically assign the current user when creating issues from TODO/FIXME comments via code actions.

Changes

• New setting: githubIssues.assignToMeOnCreate (default: false)

  • Controls automatic assignment of current user to newly created issues
  • Disabled by default for backward compatibility

• Enhanced createTodoIssue logic:

  • Retrieves authenticated GitHub user when setting is enabled
  • Merges with existing assignees from @username mentions in comments
  • Fails gracefully if user retrieval fails

Example

With "githubIssues.assignToMeOnCreate": true:

// TODO: refactor this method
function foo() { ... }

Triggering "Create GitHub Issue" on the TODO comment creates an issue assigned to the current user.

// TODO @teammate: refactor this method  
function bar() { ... }

Both the current user and @teammate are assigned to the created issue.

[!WARNING]

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• update.code.visualstudio.com
  • Triggering command: /opt/hostedtoolcache/node/20.19.6/x64/bin/node node ./out/src/test/runTests.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>FR: "create issue" code action (triggerable on FIXME's) could assign myself to the issue</issue_title> <issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes microsoft/vscode-pull-request-github#6176

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